Presser-foot mechanism.



F. M. PECK.

PRESSER FOOT MECHANISM.

APPLICATION min ocr. 15. 1915.

1,206,904. Patented Dec. 5, 1916.

2 SHEETS-SHEET l.

ign

gzvezz Zoff F. M, PECK.

PRESSER F001 MECHANISM.

APPLlCATION FlLED OCT. l5, i915.

Patoutcd Dec. 5, l9l6.

2 SHEETS-SHEET 2.

'UNTT sTaTTs PATENT oraison.

FRANK M. PECK, 0F MILLIS, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A. CORPORATION OF NEWVJERSEY.

PRESSER-FOOT MECHANISM.

Application filed October 15, 1915.

To all whom t may concern:

Be it known that I, FRANK M. PEGK, a citizen of the United States, residing at Millis, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Presser-Foot Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to shoe sewing machines and more particularly to presser foot mechanism employed in connection with such machines.

The object of the present invention is to provide certain new and useful improvements in connection with presser foot locking mechanism for sewing machines.

. With thisobject in view the several features of the invention consist in certain novel features of construction, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings illustrating the preferred form of the invention; Figure 1 represents a side elevation of a sewing machine embodying the invention; Fig. 2 is a detail illustrating a plan view of the mechanism for locking the presser foot controlling bar; Fig. 3 is a detail showing a view similar to Fig. 1 partly in section; and Fig. 4 is a cross sectional view taken upon the line 4-4 of Fig. 2.

The machine shown in the illustrated em bodiment of the invention is substantially the same as that disclosed in the application of Ashworth, Ser. N o. 769,566, filed May 24, 1913. This machine comprises a work support 1 and a coperating presser foot 2 which is mounted upon one end of a presser foot lever 4 fulcrumed at 5. The presser foot is actuated during the operation of the machine to first engage yieldingly with the work and then positively move a predeter-` mined distance to clamp the work during the formation of a stitch, and is finally elevated and retained in this position during the feed movement of the work after which the cycle of operations is repeated. In order to actuate the presser foot in this manner Specification of Letters Patent.

Patented Dec. 5, 1916.

Serial No. 56,150.

the lower end of the presser foot lever is connected through a link 7 with an actuatmg lever 8 pivoted between its ends to a controlling bar 9 which is locked at predetermmed intervals in a block or head 10 through a locking device indicated generally at 11, to be hereinafter described. The lower end of the actuating lever 8 is connected through a link 12 with a tension spring 13 which normally tends to swing the presser foot lever in a direction to move the presser foot into engagement with the work. The upper end of the actuating lever 8 is connected to the lower end of the usual operating lever 15 through a link 16. The actuating lever is fulcrumed at 14 and has its opposite end operatively connected with a rotary cam disk indicated at 17. At the completion of the feeding movement when the work is to be clamped in' position by. the presser foot the controlling bar 9 is free to move, and the spring 13 accordingly swings the actuating lever 8 about the connection with thllink 16 to move the presser foot into yi ing engagement with the Work. The controlling bar is then locked in position and a cam disk 17 operates through the lever 15 to swing the actuating lever about the connection with the bar 9 to impart a positive movement of predetermined extent to the presser foot.

It is desirable to provide a simple and compact mechanism for locking the' bar 9 relative to the block 10 at predetermined intervals and to release Vthe bar to permit its free movement relative to the block 10. It will be noted from an inspection of the drawings that the bar 9 is received in a longitudinal bore formed in the head 10 and is engaged by a clamping jaw supported upon the head. The clamping jaw is conveniently actuated by a sliding plate which is provided with a cam slot engaging with the jaw, and means for reciprocating the plate during each cycle of operations of the machine. To this end the clamping jaw 18 is pivoted at its lower end upon a stud 20 secured in the block 10. The clamping jaw is seated in a transverse recess formed in the block and intersecting the bore in which the bar 9 slides in order that the face of the clamping jaw may engage at intervals with the controlling bar to clamp the bar relative Q Y Y receso/e to thevblockl0. LThe' upper end of the clamping jaw is engaged by a sliding plate 2l provided with a cam slot 23 Which receives an upstanding'projection 24 formed upon the jaw, Vas shown clearly in Figs. 2 and 4( The sliding plate is supported upon the block l0 and is guided relative to the block by a guide member 25 projectingupwardly from the block and received in a straight slot 26 formed in the plate.

' in order to retain the plate in oper tive relation to the clamping jaw the projection 24 is provided with a flanged head vvhichV extends beyond the* sides of the caml slot- 23 With this construction it Will be obvious that; a rectilinear movement oi the sliding plate Vswings the clampingjaw rabout the lower end to engage or disengage the controlling'- bar 9. Y

in, order to insure the positive locking of the controlling'bar relative to the block 10 Y the bar is conveniently provided With a threaded portion 27 of suitable length which is engaged by similarly shaped teeth 28 formed upon the cooperating 'face of-Ythe clamping jarv. The movements of the'slidi ing plate are contralled in th'e'usual manner through a vcurved lever 30 fulcruniedf upon .a

shaft 31' and directly' connected at oneend to the sliding vplate 21. Theflever disnor# ni'ally maintained in; positiony tefloclethe controllingffbarthrough a spring conI nected With the-opposite end of thelever' and is unlocked at predeterminedy intervals by 'an' arm 3G ulcrumed upon the'shaiit and connected to the lever 30 throughthe usual type of lost motion connectfo While it is'preferredto einplo7 thespeciic construction andY arrangement of parts Vshown and described, it vvill be understood that this construction and `arrangement is not essential except so far-fas speciied'in the claims, and may be changed ormodiied Without departing from thebroader 'features of. the invention. Y

T he invention havingbeen described, what is claimed is Y l. n presser' foot mechanism vfor sewing machines, having in combination, a presser foot, a Vcontrollingjbar connectedwith Vthe Y presser foot, a block through Which'the bar passes, a clamping )avv supported upon the block, a sliding plate provided with a cam` slot engaging the jaw7 and means for recip- 1 rocating the plate during each cycle of oping jaw.

2. A presser' machines,v having in combination, a presser foot', a Acontrolling barconnected withv the presseri'oot, afbloclr through which the bar passes, a clamping' jaw lpivoted upon -tlie foot mechanism for sewing erations of the machine to actuate the clamp-AY block, a sliding plate for inovinglthe clampslotlen'gagilngthe Ljavv, connections between the 'block''and plate for guiding.V the plate in a rectilinear-2oath, and means for reciprocatg-'- ingthe plate duri'ng'ieach cyelefof .operations ofy the machinesV Y 42:' Afpresserffoot mechanism for sewingmachines, having 'in combination, alpresser foot," a .threaded :controlling bar-l: connected With'thefpresser ioot,aV` block through which L the bar passes',v a clamping Jaw pivotedupon the block and having a toothed ysurfaee arranged to engage with' the threadedV portioni of the bar, and mechanism-.for movingthe clamping .j avv-'toward and from the Abar dun ing 'each cvcle ofy operations ofthe machine.;

nnann M. enen..

Copies of this patent may be obtained for ve cents eachgby, .addressingthe Commissioner fvvatenits.

i Washington, D. G. 

